Rotary drier.



W. ErPRINDLE: ROTARY DRIBR. APPLIOATION FILED 1123.23, 1913.

^ Patented June 2,1914.

2 SHEETS-SHEET 1.

MN. @Km

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lW. B. PRINDLB.'

ROTARY DRlEB.

APPLICATION FILED APR. 2s, 1913;

Patented June 2, 1914.

2 SHEETS-SHEET 2 WILLIAM E. PRINDLE, OF MANITOWOC. /VISCONSI;

ROTARY DRIER.

Specification of Letters Patent.

patented June :5, infie.

Application filed April 23` 1913. Serial No. 763,085.

To all whom it may concern:

Be it known that I, Yi'iLLLxM F. PiuNnLr, a Citizen ot' the United States, and residing at Manitowoc, in the county of ilanitowoc and State of Nisconsim have invented certain new and useful improvements in .1totary Driers, of which the following is a specifieation, reference being' had to the drawings annexed hereto.

ll'ly invention relates generally to driers, and more Specifically to the class of inclined rotar)T driers having` an internal cylindrical hot an.' line provided therein for the purpose ot' drying wet material fed into the drier:

Une et' the principal objects oi. this 1nvention is the provision of an improved drier vwherein high temperatures are eli'ectively employed at the point where, ordinarily, the material is at iteI coldest and ivettest stage: and which is furthermore designed to obtain the application of graduated lower temperatures to the material a5 it correspondingly parts with its moisture in its progression to the rear or discharge end. Another objeet of my invention is' a novel and eil'ectii'e arrangement of drier parts Iat the feed end. pnrposed to relieve the restricted condition ordinarilyfound at this end of lheadrier, with a view to aii'ord a larger open space at this point to obtain a more uniform action oi theaisual induction nieans. A further object is the provision ot' novel means adapted'to regulate the lion and distribution of heated air from the hot air cylinder; and a still further object is to provide an effective' high-duty drier wherein the heat'unite are economi- 'ally and effectively applied to the material to the utmost. ad -antage.

These, together with such other objects as may'hereinafter appear, or are incident to my invention, l attain by means oi a eonstruetion illustrated in preferred torni i-nthe accompanying drawings. wherein 1 Figure l is a longitudinal sectional viewi of .i drier embodying my invention.

Figure f2 a transverse section through the front end ot a drier in Figure l.

Figure 3 is an enlarged detailed drawing of a portion of the line in Figure l; and

Figure 4 is a cross-,section ot Figure il alture` the line lillil ln describing my invention, the letter A indicates; the outer ebvf'liiulrical shell preterably lying at an angle to the horizontal.y and raised to rotate in the usual manner by 'for suitable gearing B, and mounted on bases t) having' rollers T in supporting engagement with tires b lormedv on the shell.

represents the lui-nace chamber which is shown positioned under the shell A, hav-- in e' its walls continued upwardly to sur round'the forward portion t) of the shell and spaced a way therefrom. totorni an inclosed hot air chamber l)r` which is provided Yfor the purpose ot receiving the healed air and gascspassing upwardly through the checkered arch l() from the furnace.

Positioned about the upper portion of the hot air chamber l) to forina supple inentary air chamber li is an exterior covering 1l, provided with an air inlet openinli;A l! and an outlet opening i3, which latter coinlnunicateswith the furnace chamber through a depending connecting pipe lf, having its lower cud ybit'urcated to provide the two oliset extremitiesll and 15 .extending laterally through a side wall of the lurnace chamber. the lornier terminatingv mediately under the *furnace grate ata. 'oie other at a point transversely intermediate the bridge wall 1G and rear wall 17.

The air in the lSiipplementary chamber l" which becomes heated liv the high tempc tures existing in the adjacent chamber 1),'

has an induced flow from the chamber E to the furnace chamber l through the suction blower j' interposed in the pipe connections. This induced flow is controlled by a dauiper ,(j/ mounted in each of the oli'set extremities 14- and 1.1 allerdinga convenient means regulating the furnace draft, and also for moderating at will the degree of heat within the chamber D. Should the necessity arise for a rapid cooling down of the drier, a cold air inlet /i is provided in the walls of the chamber D for that purpose.

The numeral 18 indicates a suction tan communicating with the front end oi the` drier through a stationary vapor bonnet i9, about which the said frontend rotates.

'Carried by the bonnet and'projeetineY into ends by clanipiug elements passing through a series of spaced separators thus provid ing the outlets 23. The latter are protected against the ii'itrusion ci. material therethrough into the liuc, by the provision of a rearwardly extending guard 24, one end of which is fastened securely about the section 21 (preferably by the clamping elements above referred to), :iiid'itsjlared rear end.

may be braced by similar separating menibers Q5 interposed and secured between it and the periphery oit' the smaller section Q2.

The walls of that portion of the rear flue section within the guard M are perforated to provide a series of protected ports Q6 througl'i which additional hotifair may be closed by the sleeve, the llatter on sleeve being slotted at 27n to receive the bolt and to permit this movement.

lnclosing the rear end of. the shellis aliood 28 having internal lifting arms 29' which, as the drier revolves, carries the dried material into a cone discharge 3() lead ing into the discharge outlet 3l, formed i111 the rear tace of the hood 28, The rear end ot' the flue 'H terminates short of the hood Z8 i and has a liared. rear outlet governed by an air valve 32 which has reciprocative movement to open and close the outlet through av suitably supported rod 33 which extends ,i through the hood for its convenient operation.

From an inspection or' Figures l and will be seen that the front portion of the drier shell is completely inclosed and has axial movement within the hot air chamber D, which latter as previously stated is posi tioned directly above the furnace chamber C to receive the heated gases therefrom, and to all substantial etlect forms an integral portion. thereof.

This arrangement provides for the direct application of the highest temperatures toI the wet and. cold material as it is fed into the drier shell through the feed spout, but in order that `the material in its `progression rearwardly toward the discharge end be further subjected to heat and thereby evapo rate retained moisture, I provide a row of alined and intervalcd openings indicated at:

Bel'and 35 in the walls ot that'portion of the drier shell A within the hot air chamber and in the walls of the forward end of the flue H respectively. These openings are connected by the radial conduits 3G flanged for purposes of .attachment to the walls of the i'espective cylinders.4 lt will be here noted that the front end of the flue H closed,

e, au

and ternlinates at a point removed from, or .short of, the feed end of the drier shell. The flue being thus closed at its front end, then with the exhaust fan in operation, the hot gases in the chamber D have an induced flow past the conduits, through the flue H and thence through the flue outlets as de sired.

In thepractice of my invention, I have found it preferable to employ an auxiliary row of conduits as at 86 differing only from the others in that they have play room in the eccentric or slotted openings 35 to allow for expansion andcontraction of the llue,

the inner annular flange in this Vcase not being fastened to the Hue, but nevertheless providing a tight joint between the conduits and contiguous portions of the flue Wall. Expansion and contraction of the inner cylindrical'liue is also taken care of through ,is subjected to exceedingly high temperai loo tures to heat the mass and evaporate a large percentage of the moisture therein contained.

As the drier revolves the material is cas caded by the series of liftingwblades 38 and 8S), and in its progression rearwardly to the discharge end constantly parts with its heat radiating from the inner Hue, until it reaches the discharge end as a uniformly dried product.` Correspondingly', the heated air and gases in the flue suer a gradual reduction in temperature'and velocity when 'passing rearwardly, so .that the. dry and light material at the rear end is not scorched or disturbed. i

Furthermore, the arrangement of the drier front end is such that :i large arca of open space is afforded at this point, permitting uniform action of the suction fan which etlectually exhausts the heavy moisture at that end, but does n ot draw out light parti- 4 cles where the temperature is loin, as the velocit-y correspondingly diminishes. This situation is aided by the provision of the intermediate outlets Q3, through which air and gases of a now reduced temperature pass. the air valve 32 and further increased by opening the orts 26, or4 may be decreased at this point by closing the ports and open- ,y ing the valve, whereby a lesser or greater This liow is accelerated by closingv '1.0.5 moisture as it comes into contact with the ioA Another feature of my-invention is the' 'provision of the supplementary chamber E which not only retards atmospheric radiation oi heat from the hot air chamber but utilizes heat ordinarily lost, which tloivs through theconnections to the furnace under complete control, the damper f/ in the pipe sections being opened or closed to accelerate or reduce the draft in the furnace as the case may be, or to increase or diminish to .lsjomeD extent the temperature in the cham- The entire operation is continuous and.

under complete control. The essential teatures, elements and the operation of the machine, together with its simplicity and other advantages thereof, Will be readily apparent to those skilled in the art.

Having thus 'described my invention and illustrated its use, What I claim as new and desire to secure by Letters Patent, is the following 1. The combination in a rotary drier, ot' an outer shell provided with a teed opening, an inner tine mounted therein for conducting heated air rearwardly through the shell, a hot air supply chamber coninninicating with the said inner flue and providing a means for externally heating the :teed end portion of said shell, and' means tor indue-- lng a flou' of heated air through. the said inner flue to other portions of the shell.

2. In a. rotary drier, the combination of an, outer cylinc er having affeed member, a hot air chamber forming in extension of a furnace chamber and surrounding the feed end portion of the outer cylinder an inner hot air cylinder receiving its source of heat from one of the said chambers, and exhaust means at. the feed endet the outerjcjvlinder adapted t., induce a tloiv of heated air rearwardly through the inner cylinder t'o the uninelosed portion of the outer shell.

.3. In a drier, an outer shell, an inner hot air flue mounted therein adapted to conduct heated air rearwardly and having a closed front end, and a hot air chamber communieating radialy with the said inner flue, substantially as and for thc'purpose set forth.

4. In a drier, a hot air' chamber, a drier shell having a portion of its length received within the said chamber for the external applieath-n of heat thereto, and means for internally conducting heated air through the other` portion vot the drier shell consisting ot an inner tlue suspended Within the drier shell.

5. In a machirn of the class described for drying wet. materia]`| thefcombination ot a drier shell provided to rece-ive therein the material to he dried, a furnace chamber hav ing its walls continued upwardhv lo torri hot air chamber. the said drier shellhafsing a portion ot` its length received within the hot air chamber 'for the direct ai'ipliealiou of external heat to the wet material, and conducting' means ivithin the drier adapted to receivel a supply ot heat trom the said hot air chamber, vvherebv the material in its progression to the other portion ol the drier shell is deprived ot any retained moisture.

6. In com-l'iination, en outer drier shell. a hot air conductor mounted therein and couiprising two sections disposed in telescopic relation thereby providing an outlet to the outer shelLoneot the sections being provided with supplementary outlet openings toi-mcd in its Walls, and controlling means tor the supplementary 'outlet openings, silbstautially as described.

7. iIn eon'ibinat-ion in a drier, a furnace chamber C, a drying cylinder an outer chamber E having an outlet in its walls, an intermediate hot air chamber D adapted to receive hot air or gases from the said t'urnace chamber for applicationto the said c vlinder and said chamber E, and a connection between the said outlet and the furnace chamber, substantially as described.

8. In coml'lination, an exhaust member, a cylindrical drier shell communicating at its front end with the exhaust member, hot air supply chamber D inelosing the said shell adjacent the front end, a hotI air conductor lying ivithiu the drier shell and communicating with the hot air supply chamloer through one or more lateral conduits,

the front end of the conductor being closed and terminating at a point short of the drier.

front end, all so arranged to obtain a uniform flow of heated air through the conductor on actuation ofthe exhaust member.

9. In a rotary drier, an outer shell, a hot air conductor lying Within the outer shell and provided with an intermediate air outlet, said conductor communicating at one en d with a source of heat and having an out let opening at its other end, and valvular means to close the said outlet opening whereby the heated air then flows through the in termediate outlet, thereby decreasing the v temperature of that portion ofthe drier contiguous to the said outlet opening.

l0. In a rotary drier, exhaust means, an outer drying shell communicating at its feed end with said exhaust means, means to externally heat that portion of the drying shell which first receives the cold and Wet mate rial comprising an inclosing l it .fiir chainber, means for conducting heat to other portions of the drying shell consisting of a cyliiidrical member having one or more radial -conduits openingin the Walls of the outer shell, and provided with an outlet openinff.

l1. In combination, an outer drier shell,

fte

air mnductor indented therein andl fili' teleseeping sections, said eenu l i nrevidedJ with an outlet eenimuni-eatinkl with the outer shell, a suppley nullel, .termed in the Wall of one of is, and a heed n'iounted on the eenled te Lguard beth of the said anti;l ily as deFseribed. ibimiliiin an outer drier shell, a 'led th rein previded with an @nu ern- ..iunieat 'with the outer Shell and pleniei'ita'ry outlet, a rearwardly exlngr grund abent the said outlets, and #filling means; Ll'er the supplementary .Qinieieting eil a sleeve disposed within "rrd and minable en. the said flue. inatin'n, a het air chamber D, zar enainlier E abdyethe chamber D7 cylinder A. and'an inner cylinder dapted le reeeive heat from the het air aber D, and a ennduit l*1 having its inlet in the ehan'iber E and depending ein te'ennnnunieatey with the chamber tially as described.

binalien, exhaust means, a drier d:'nal healing chamber surroundwmidueler cylinder (flispnfsml 'within the drier ehr-ll and adapted le eennnunieate with the iii .ici-nal luvalinkr;l ehan'iber.

i eeml'iinatien, an enter drier shell, f 'er-rml healing chamber eurreurulingrl eind oit' the enter Shell, a eendnetur dispesed within the drier shell .flajnled te etnnniunieate aty its frontI end ,n lheaaid external heatingr Chamber, and l valvular means Within the open rear end of the cylinder, substantially as described.

16. In combination, a feed member, an exhaust niernber, a drier shell A. communicating at its front end 'with said eedand exhaust members, an external heating chainber D .about said front end, an inner conductor cylinder H having its front end in proxin'iily to said feed and exhaust inem- Iiers and adapted t receive a supply of heated air from the chamber D. .i

17. The combination in a rotary drier, of a shell adapted to contain the material to be dried, means for applying the heat externally te the frent end of the shell, and means communicating With the last mentioned ineane for internally applying the heat to the material as it progresses rearwardl)Y to the dieebarge end of the shell, sul'istantially as described.

18. In combination, exhaust means, a drier shell, a conductor cylinder disposed within the drier shell and having its front end closed, an external. heating chamber extending about the front end of the drier shell and adapted to communicate with the said eeiidueter cylinder, substantlally. as deseribed.

In testimeny whereof I have hereunto signed my naine 1n the presence of the two aubeeribed witnesses.

WILLlAM F. PRINDLE.

lvitnesses 

